laoyou = list("laoyou is a teacher")
for i in laoyou[0:6]:
    print("\t",i)
for i in laoyou[7:9]:
    print("\t"*2,i)
for i in laoyou[10:11]:
    print("\t"*3,i)
for i in laoyou[-7:]:
    print("\t"*4,i)
